/Engine/Source/Editor/UnrealEd/Classes/Editor/UnrealEdEngine.h
Called when the element selection set pointer set on the global editor selection changes
void OnEditorElementSelectionPtrChanged ( [USelection](API\Editor\UnrealEd\USelection) * Selection, [UTypedElementSelectionSet](API\Runtime\TypedElementRuntime\Elements\Framework\UTypedElementSelectionSet) * OldSelectionSet, [UTypedElementSelectionSet](API\Runtime\TypedElementRuntime\Elements\Framework\UTypedElementSelectionSet) * NewSelectionSet )